Originally Posted by
luke19790_3
Or st170 springs, which I used in my cheap build
Originally Posted by
SBT83
Do they work good then? What's their limit?
Originally Posted by
luke19790_3
Don't know yet, but I'd like to get 300
think it Karlos who's using them
Originally Posted by
studabear
frs and st170 springs are for black top heads though.
Originally Posted by
studabear
Mine did 291bhp at flywheel on them, 14.5 psi boost
Yes I use the ST170 springs but as Stu points out they are for black top heads, I've not compared but I would guess they will not work as silver top engines have hydraulic lifters and black top's are solid.
As for their limit I ran 24psi (.48/60 T3) without issue.